Regular Expressions 101

Pro

^start of line

Group 1(The\s)?

?repeats the group contents below at most once:

Thethe literal text The (case sensitive)

\sany whitespace character

Group 2(cat\s)?

?repeats the group contents below at most once:

catthe literal text cat (case sensitive)

\sany whitespace character

Group 3(sat\s)?

?repeats the group contents below at most once:

satthe literal text sat (case sensitive)

\sany whitespace character

Group 4(on\s)?

?repeats the group contents below at most once:

onthe literal text on (case sensitive)

\sany whitespace character

Group 5(the\s)?

?repeats the group contents below at most once:

thethe literal text the (case sensitive)

\sany whitespace character

Group 6(mat\.)?

?repeats the group contents below at most once:

matthe literal text mat (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

^(The\s)?(cat\s)?(sat\s)?(on\s)?(the\s)?(mat\.)?

New

The cat sat on the mat.
The cat sat on the mat
The cat sat on teh mat.
The kat sat on the mat.

The cat sat on the mat.
The cat sat on the mat
The cat sat on teh mat.
The kat sat on the mat.